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Date:   Sun, 24 May 2020 23:28:36 +0200
From:   Pavel Machek <>
To:     Andrew Lunn <>
Cc:     Oleksij Rempel <>,
        Michal Kubecek <>, Marek Vasut <>,
        Florian Fainelli <>,
        Jonathan Corbet <>,,, Russell King <>,,,
        David Jander <>,
        Jakub Kicinski <>,
        Christian Herber <>,
        "David S. Miller" <>,
        Heiner Kallweit <>
Subject: Re: signal quality and cable diagnostic

On Tue 2020-05-12 15:04:18, Andrew Lunn wrote:
> > > As for getting / setting the threshold, perhaps ETHTOOL_MSG_LINKINFO_GET
> > > and ETHTOOL_MSG_LINKINFO_SET. Unless you expect more configurable
> > > parameters like this in which case we may want to consider adding new
> > > request type (e.g. link params or link management).
> > 
> > Currently in my short term todo are:
> > - SQI
> > - PHY undervoltage
> > - PHY overtemerature
> Do you only have alarms? Or are current values available for voltage
> and temperature?
> Both of these would fit hwmon. It even has the option to set the alarm
> thresholds. The advantage of hwmon is that they are then just more

> sensors. You could even include the temperature sensor into a thermal zone to influence 
> cooling. There are a couple of PHYs which already do hwmon, so there is code you can 
> copy.

Yes, hwmon can do a lot of stuff. OTOH figuring out "what hwmon device corresponds to what
network device is going to be tricky, and Im not sure if we want utilities like mii-tool to
start using hwmon interfaces...

Best regards,
(cesky, pictures)

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